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Hydrogenated TiO2 Nanorod Arrays Decorated with Carbon Quantum Dots toward Efficient Photoelectrochemical Water Splitting

  • Zhao Liang
    Zhao Liang
    School of Materials Science and Engineering, Hunan University, Changsha City 410082, P.R. China
    Institute of Materials, Ningbo University of Technology, Ningbo City 315211, P.R. China
    More by Zhao Liang
  • Huilin Hou
    Huilin Hou
    Institute of Materials, Ningbo University of Technology, Ningbo City 315211, P.R. China
    More by Huilin Hou
  • Zhi Fang
    Zhi Fang
    Institute of Materials, Ningbo University of Technology, Ningbo City 315211, P.R. China
    More by Zhi Fang
  • Fengmei Gao
    Fengmei Gao
    Institute of Materials, Ningbo University of Technology, Ningbo City 315211, P.R. China
    More by Fengmei Gao
  • Lin Wang
    Lin Wang
    Institute of Materials, Ningbo University of Technology, Ningbo City 315211, P.R. China
    More by Lin Wang
  • Ding Chen*
    Ding Chen
    School of Materials Science and Engineering,  State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, Changsha City 410082, P.R. China
    *E-mail: [email protected] (D.C.).
    More by Ding Chen
  • , and 
  • Weiyou Yang*
    Weiyou Yang
    Institute of Materials, Ningbo University of Technology, Ningbo City 315211, P.R. China
    *E-mail: [email protected] (W.Y.).
    More by Weiyou Yang
Cite this: ACS Appl. Mater. Interfaces 2019, 11, 21, 19167–19175
Publication Date (Web):May 6, 2019
https://doi.org/10.1021/acsami.9b04059
Copyright © 2019 American Chemical Society
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Abstract

Limited light harvesting and charge collection are recognized as grand challenges for the exploration of highly efficient TiO2 photoanodes. To overcome these intrinsic shortcomings, we reported the designed photoanode based on TiO2 nanoarrays with both hydrogenation treatment and surface decoration of carbon quantum dots (CQDs) toward efficient photoelectrochemical water splitting. The results revealed that hydrogenation treatment could cause the formation of oxygen vacancies to suppress the recombination of photoinduced carriers. Meanwhile, the decorated CQDs could not only play as the electron reservoirs to trap photoinduced electrons but also remarkably enhance the solar light harvesting due to their upconversion effect. The as-fabricated photoanodes exhibited a large photocurrent density of ∼3.0 mA/cm2 at 1.23 V versus reversible hydrogen electrode under simulated sunlight, which was the highest one among hydrogenated TiO2 photoanodes ever reported and was ∼6 times that of pristine analogues.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsami.9b04059.

  • Microstructural characterizations, UV–vis spectra, and PEC performances of CQDs, pristine TiO2, CQDs/TiO2, H/TiO2, and CQDs-H/TiO2 nanoarray samples (PDF)

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